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Vapor transport analysis of a chloride molten salt flow control valve

AIP Conference Proceedings

Armijo, Kenneth M.; Mendoza, Hector; Parish, Jeffrey

This investigation explores thermal-fluid flow phenomena in a proportional flow control valve (FCV) within a 2 in. ID high-temperature piping transport system. The FCVs are critical components to ensure flexible nominal operation of a 2 MWth concentrating solar power (CSP) pilot-scale system in present development at Sandia National Laboratories (SNL). A computational fluid dynamics (CFD) / finite element analysis (FEA) model was developed in ANSYS that investigates multifluid phase-change transport within various sections of an FCV to explore plating and subsequent thermal-mechanical stress challenges that can exist with operations as high as 730°C. Results from the thermal-fluid model in development suggest salt vapor phase change in the N2 gas purge lines as low as approximately 476°C, which can have a negative impact on valve reliability.

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TYPE Conference Paper YEAR 2022
OSTIScopus

EMISSIONS ABATEMENT OF PEPPER ROASTING UTILIZING A CONCENTRATING SOLAR TOWER THERMAL HEAT SOURCE

Proceedings of ASME 2022 16th International Conference on Energy Sustainability, ES 2022

Armijo, Kenneth M.; Overacker, Aaron A.H.; Mendoza, Hector; Madden, Dimitri A.; Bays, Nathan R.; Armijo, Kenneth I.; Montoya, Randolph

Research is presented for carbon emissions abatement utilizing concentrating solar power (CSP) heating for culinary industrial process heat applications of roasting peppers. For this investigation the Sandia National Laboratories (SNL) performed high-intensity flux profile heating, as high as approximately 12.2 W/cm2 roasting peppers near 615oC. This work also explores the suitability of culinary roasting as applied to different forms of CSP heating as well as techno-economic costs. Traditionally, chile pepper roasting has used propane gas source heating to achieve similar temperatures and food roasting profiles in batch style processing. Here, the investigators roasted peppers on the top level of the National Solar Thermal Test Facility (NSTTF) solar tower for multiple roasting trials, with and without water. For comparison, the team also performed roasting from a traditional propane gas heating source, monitoring the volume of propane being consumed over time to assess carbon emissions that were abated using CSP. Results found that roasting peppers with CSP facilitated approximately 26 MJ of energy that abated approximately 0.122 kg CO2/kg chile for a 10 kg bag. The team also determined that pre-wetting the peppers before roasting both under propane and CSP heat sources increased the roast time by approximately 3 minutes to achieve the same qualitative optimal roast state compared to dry peppers.

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TYPE Conference Presentation YEAR 2022
DOIOSTIScopus

Ganged-PV System Evaluation

Armijo, Kenneth M.; Overacker, Aaron A.H.; Madden, Dimitri A.; Clair, Jim

The following report contains data and data summaries collected for the SkySun LLC elevated Ganged PV arrays. These arrays were fabricated as a series of PV panels in various orientations, suspended by cables, at the National Solar Thermal Test Facility (NSTTF) at Sandia National Laboratories (SNL). Starting in February of 2021, Sandia personnel have collected power and accelerometer data for these arrays to assess design and operational efficacy of varying ganged- PV configurations. The purpose of this power data collection was to see how the various array orientations compare in power collection capability depending on the time of day, year, and the specific daily solar direct normal irradiance (DNI). The power data was collected as a measurement of the power output from the various series strings. The project team measured direct current (DC) voltage and current from the respective arrays. The accelerometer data was collected with the purpose of demonstrating potential destructive mode shapes that could take place with each of the arrays when exposed to high winds. This allowed the team to evaluate whether impacts with respect to specific array orientations using suspended cables is a safe design. All data collection was performed during calendar year 2021.

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TYPE SAND Report YEAR 2021
DOIOSTI
Results 26–50 of 133
Results 26–50 of 133
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